/* Copyright 2025 The OpenXLA Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#ifndef XLA_SERVICE_GPU_TRANSFORMS_RAGGED_ALL_TO_ALL_CANONICALIZER_H_
#define XLA_SERVICE_GPU_TRANSFORMS_RAGGED_ALL_TO_ALL_CANONICALIZER_H_

#include "absl/container/flat_hash_set.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "xla/hlo/ir/hlo_module.h"
#include "xla/hlo/pass/hlo_pass_interface.h"

namespace xla {
namespace gpu {

// Rewrites all `ragged-all-to-all` instructions to a canonical form.
//
// The canonical form is a `ragged-all-to-all` instruction with all offset and
// size operands of type S64.
class RaggedAllToAllCanonicalizer : public HloModulePass {
 public:
  absl::string_view name() const override {
    return "ragged-all-to-all-canonicalizer";
  }

  absl::StatusOr<bool> Run(
      HloModule* module,
      const absl::flat_hash_set<absl::string_view>& execution_threads) override;
};

}  // namespace gpu
}  // namespace xla

#endif  // XLA_SERVICE_GPU_TRANSFORMS_RAGGED_ALL_TO_ALL_CANONICALIZER_H_
